In Wireless Sensor Network (WSN), the IEEE 802.15.4 (Zigbee) protocol stack is a promising technology to attain minimum power transmission in the minimum-rate and short rangewireless Personal Area Network (PAN). The cluster tree topology of IEEE 802.15.4 consists of a PAN coordinator, cluster coordinator and numerous sensor devices. During a period of time, the PAN coordinator transmits the bea...

A smart helmet-based wearable personnel proximity warning system was developed to prevent collisions between equipment and pedestrians in mines. The helmet worn by receives signals transmitted Bluetooth beacons attached heavy equipment, light vehicles, or dangerous zones, provides visual LED warnings the operators simultaneously. performance test of proposed conducted an underground limestone m...

This paper evaluates the spatial dimension of agent-based model uncertainty and sensitivity. Monte Carlo simulations are carried out, leading to distributions of results, recorded for each agent. The results are aggregated into zones of varying shape and size. Output variance decomposition is performed on the zones in order to quantify model sensitivity to every input. For every zone, inputs th...

Time synchronization and localization are key requirements for distributed underwater systems consisting of numerous low-cost submersibles. In these systems, submersibles are highly resource constrained and typically have limited acoustic communication capability. We investigate the problem of tracking submersibles that only have the capability of receiving acoustic signals. Traditional Long Ba...

SUMMARY The purpose of this study was to determine whether dual-echo fast fluid-attenuated inversion recovery MR imaging and corresponding T2 brain maps can show different zones in the affected white matter of patients with cerebral X-linked adrenoleukodystrophy. Ten male patients with cerebral X-linked adrenoleukodystrophy underwent imaging performed using dual-echo fast fluid-attenuated inver...

LR-WPANs have two types of networks: beacon–enabled and non-beacon-enabled networks. In beacon-enabled LR-WPANs, the high reliability of Beacon frame transmission is required because all transmissions is controlled by the in-formation in the Beacon frame. However, the process to handle the case for the beaconloss is not well-defined in the standard. In this paper, an enhanced protocol for the c...

We study three representations of hierarchies of partitions: dendrograms (direct representations), saliency maps, and minimum spanning trees. We provide a new bijection between saliency maps and hierarchies based on quasi-flat zones as used in image processing and characterize saliency maps and minimum spanning trees as solutions to constrained minimization problems where the constraint is quas...